Screen stretching and take-up device



Jan. 6, 1942. G. w. BEHNKE 2,268,853

SCREEN STRETCHING AND TAKE-UP DEVICE Filed Dec. 1, 1939 Patented Jan. 6,1942 SCREENST-RETOHING AND DEVICE I I George W. Behnke, Durand,.Mich.,:assignor to.

Simplicity Engineering Company,

Mich.

Durand;

ApplicationxDecembcr 1, 1939, .SerialINo.307175 3.Claims. 7 (Cl.209-403) This invention relates to gyrating screws-for screening sand,gravel, and other materials of a fragmentary classification, and moreparticularly to a means for stretching and providing forincreasedtension as desired.

One of the prime objects of the invention is to provide a screen take-upincluding resilient means for exerting a continuous tension on thescreen at all times.

Another object is to provide a screen take-up means which can beadjusted to take up slack or wear, which is so located as to protect itfrom the abrasive action of the material flowing over the screen, andwhich eliminates dead screening areas and pockets caused by looselymounted or slack screens.

A further object is to provide a screen take-up assembly of simple,practical, substantial, and economical construction, which can bequickly and easily manufactured and applied, and which facilitates thequick and easy removal or application of the screen to the screen frame.

With the above and other objects in view, the present invention consistsin the combination and arrangement of parts, hereinafter more fullydescribed, illustrated in the accompanying drawing, and moreparticularly pointed out in the appended claims, it being understoodthat changes may be made in the form, size, proportion, and minordetails of construction, without departing from the spirit orsacrificing any of the advantages of the invention.

In the drawing: 1

Fig. l is a fragmentary, part sectional, side elevational view showingthe discharge end of a gyratory screen illustrating my take-up inposition, the broken lines illustrating the stretching of the screen.

Fig. 2 is a fragmentary top plan view thereof.

Fig. 3 is also a fragmentary top plan View showing the main body orportion of the screen.

Referring now to the drawing in which I have shown the preferredembodiment of my invention, the numeral 8 indicates a conventionalscreen such as used for screening sand, gravel, and other fragmentarymaterials of a similar classification. This is mounted and stretchedover a screen frame 9 having screen take-up side brackets H] on theoutside of the side plates and a take-up rail II is provided on theinside of the frame as shown, bolts I2 being provided for tightening thescreen transversely of the frame in the usual manner.

The conventional method for securing the discharge end of the screen isto provide a plurality hook-shapedmember whichare inserted through 3member for securing it in position.

Insuch construction-the material being processed flows over the face ofthe screen and over the entire assembly which makes up this fastenfingmeans, and in a relatively short time, the

abrasive action of the material being screened, wears it so thatfrequent replacements are necessary, furthermore such assembly has noautomatic take-up or stretching properties.

In the instant construction, an end angle B is provided as shown andforms a part of the frame, being secured in position in any approvedmanner, and a screen end bar 14 is mounted thereon, suitable openings l5being provided in said bar in spaced relation and accommodate take-upbolts [6 which extend through slotted openings l1 provided in thehorizontally disposed leg l8 of the angle B.

An imperforate plate member l9 forms an extension of the screen frame,the leg 2|] being disposed in facial contact with the angle B as shown.The bolts l6 are bent as clearly shown in Fig. 1 of the drawing, thethreaded ends projecting through openings 2| provided in the verticallydisposed'legs 20 and 22 of the members B and [9 respectively, and a nutand washer 23 and 24 respectively, are provided on the threaded end ofthe take-up bolt, a coil spring 25 being interposed between the leg 20and the washer 24 so that a tension or stretching action is provided onthe screen at all times, and this can be regulated by adjusting the nut23 to provide for increased tension as required.

The imperforate deck extension lip or plate l9 forms an extension orcontinuation of the screen body and the material flows thereover so thatthe spring nut and bolt are protected from the product being processed.

The assembly is simple, sturdy, and economical, it provides a stretchingmeans and a take-up, so that the screen is properly stretched at alltimes, the tension can be adjusted as desired and necessary to producethe best results commensurate with the product being processed, and italso provides for quick and easy mounting or detachment of the screenproper.

From the foregoing description, it will be obvious that I have perfecteda very simple and practical screen take-up and stretching means whichexerts a tension on the screen at all times.

What I claim is:

1. In a screening-device of the character described, the combination ofa frame including spaced side and upper and lower end members, a wovenWire screen disposed between and secured to said side members and to theupper end member, slotted openings in the horizontal face of the lowerend member, and downwardly curved bolt members anchored in the dischargeend of the screen and extending through said slotted open ings with thethreaded ends projecting forwardly beyond the end of the screen, meansassociated with said bolt for exerting continuous longitudinal tensionon said screen, and an imperforate lip projecting over said means andforming an extension of said screen frame.

2. In a screening device of the class described, the combination of aframe including end and side members, a screen secured to said sidemembers and the upper end of the frame respectively, a bar connectingthe side members at the discharge end of the frame, slotted openings inthe horizontal face of the bar, curved take-up bolts anchored in thedischarge end of the screen and extending through said slotted openings,with the threaded ends projecting forwardly beyond the end of thescreen, adjustable means on the end of the bolts, resilient meansinterposed between the adjustable means and the screen frame to providea constant tension on said screen, and an imperforate lip projectingover said resilient means and forming an extension of said screen frame.

3. In a screening device of the character described, the combination ofa frame, a Woven wire screen disposed over said frame and rigidlysecured to the sides and the upper, end thereof, longitudinally slottedopenings in the lower discharge end of the frame, curved anchor boltassemblies anchored to one end of the screen and extending through saidslotted openings with the free ends curved to extend substantially atright angles and projecting through the end wall of the frame,adjustable means on the threaded ends of the bolts, springs interposedbetween said adjustable means and said frame to provide a constanttension on the screen in a longitudinal direction, and an imperforatelip forming an extension of the screen and a shield for said assembly.

GEORGE W. BEHNKE.

